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auto-save: 2026-06-28T09:43:58 (3 files) — public/js/showroom.js server.js data/thumb-cache/

61fe1e273d6d56416b7687a29a33aff5cfba7fc9 · 2026-06-28 09:44:01 -0700 · Steve Abrams

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commit 61fe1e273d6d56416b7687a29a33aff5cfba7fc9
Author: Steve Abrams <steve@designerwallcoverings.com>
Date:   Sun Jun 28 09:44:01 2026 -0700

    auto-save: 2026-06-28T09:43:58 (3 files) — public/js/showroom.js server.js data/thumb-cache/
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 public/js/showroom.js                         |  30 +++++++----
 server.js                                     |  75 ++++++++++++++++++++++++++
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diff --git a/public/js/showroom.js b/public/js/showroom.js
index 13cb69b..6aa41db 100644
--- a/public/js/showroom.js
+++ b/public/js/showroom.js
@@ -1554,21 +1554,28 @@ function loadWingBook(pivot, onDone) {
 const sliverTexCache = {};
 let _sliverInFlight = 0;
 const SLIVER_MAX = 3;          // concurrent thumbnail fetches (budget-safe)
-const SLIVER_THUMB_PX = 120;   // downscaled width for remote Shopify images
+const SLIVER_THUMB_PX = 160;   // downscaled width — 160 keeps a steeply-raked sliver legible (Contrarian: 120 squeezed to ~3px = mush)
 let _sliverPumpAt = 0;
 const SLIVER_PUMP_MS = 90;     // min gap between kicking off new thumbnail loads
 
-// Build the low-res source URL for a board's pattern. Remote Shopify images get a
-// width param so the CDN downscales server-side; local /gen-tiles are already small.
-function sliverThumbSrc(imageUrl) {
+// Build the LOW-RES source URL for a closed board's sliver. Routes through the server's
+// /api/thumb downscaler (sharp, disk-cached) so the texture budget stays tiny:
+//   • local gen-tiles (which are 2000²+ 12 MB PNGs!) → downscale by SKU, NEVER served raw
+//   • remote heroes → downscale the whitelisted URL
+// Falls back to the raw proxy only if neither a SKU nor a remote URL is available.
+function sliverThumbSrc(product, imageUrl) {
+  const sku = product && (product.sku || product.mfr_sku);
+  // Prefer the SKU path: it downscales the crisp local gen-tile (and dodges a 12 MB PNG).
+  if (sku && imageUrl && imageUrl.charAt(0) === '/' && imageUrl.indexOf('/gen-tiles/') !== -1) {
+    return '/api/thumb?sku=' + encodeURIComponent(sku) + '&w=' + SLIVER_THUMB_PX;
+  }
   if (!imageUrl) return null;
-  if (imageUrl.charAt(0) === '/') return imageUrl;                       // local tile/asset — already small
-  // Append Shopify's width= param INSIDE the proxied URL so the CDN returns a tiny JPEG.
-  let thumbUrl = imageUrl;
-  if (imageUrl.indexOf('cdn.shopify.com') !== -1) {
-    thumbUrl += (imageUrl.indexOf('?') === -1 ? '?' : '&') + 'width=' + SLIVER_THUMB_PX;
+  if (imageUrl.charAt(0) === '/') {
+    // Local non-tile asset (already small) — serve as-is.
+    return imageUrl;
   }
-  return '/api/proxy/image?url=' + encodeURIComponent(thumbUrl);
+  // Remote: downscale via /api/thumb (sharp) rather than shipping the full 125 KB hero.
+  return '/api/thumb?url=' + encodeURIComponent(imageUrl) + '&w=' + SLIVER_THUMB_PX;
 }
 
 // Apply a (real, low-res) thumbnail texture to a CLOSED board's face. Uses a cheap
@@ -1610,7 +1617,8 @@ function loadSliverThumb(pivot, onDone) {
     apply(cached);
   };
 
-  const src = sliverThumbSrc(imageUrl);
+  const src = sliverThumbSrc(product, imageUrl);
+  if (!src) { if (onDone) onDone(); return; }
   if (typeof createImageBitmap === 'function' && src.charAt(0) === '/') {
     fetch(src).then(r => r.blob()).then(b => createImageBitmap(b))
       .then(bmp => buildFrom(bmp))
diff --git a/server.js b/server.js
index e1c20f4..2df030f 100644
--- a/server.js
+++ b/server.js
@@ -145,6 +145,81 @@ app.get('/api/proxy/image', (req, res) => {
   }
 });
 
+// ============================================================
+// SLIVER THUMBNAIL — downscaled real-design strips for the CLOSED wingboards (V1).
+// The PJ photo shows a thin sliver of EVERY real design in the packed arc. Painting
+// the full assets onto closed boards is wasteful (local gen-tiles are 2000²+ 12 MB
+// PNGs; remote heroes are 125 KB). This serves a tiny JPEG (default 128 px wide) of any
+// allowed source, downscaled with sharp and disk-cached, so 24 closed slivers cost a
+// few KB each instead of multiple MB. Used ONLY for closed slivers; the open hero still
+// loads the full asset via /gen-tiles or the proxy.
+//   ?sku=<DW SKU>   → downscale the local gen-tile for that SKU (preferred, crisp + local)
+//   ?url=<https…>   → downscale a whitelisted remote image
+//   ?w=<px>         → target width (clamped 48..256, default 128)
+// ============================================================
+let sharp = null;
+try { sharp = require('sharp'); } catch (e) { console.warn('[thumb] sharp not available — sliver thumbs fall back to proxy'); }
+const THUMB_CACHE = path.join(DATA_DIR, 'thumb-cache');
+try { fs.mkdirSync(THUMB_CACHE, { recursive: true }); } catch (e) {}
+
+function sendThumb(res, buf, key) {
+  res.setHeader('Content-Type', 'image/jpeg');
+  res.setHeader('Cache-Control', 'public, max-age=604800');
+  res.end(buf);
+}
+
+app.get('/api/thumb', async (req, res) => {
+  if (!sharp) {
+    // FAIL-SAFE (not fail-heavy): without sharp we can't downscale; redirecting to the full
+    // 125KB proxy or — worse — the 12MB gen-tile PNG would invert this optimization into an
+    // FPS disaster on the rack. 503 → the client keeps the cheap synthetic-pool sliver and
+    // logs, rather than shovelling heavy assets at the GPU. (Contrarian 2026-06-28)
+    return res.status(503).send('thumb unavailable (no sharp); client uses pool fallback');
+  }
+  const w = Math.max(48, Math.min(256, parseInt(req.query.w) || 128));
+  const sku = (req.query.sku || '').replace(/[^A-Za-z0-9_-]/g, '');
+  const url = req.query.url;
+
+  // Cache key by source + width
+  const crypto = require('crypto');
+  const ck = crypto.createHash('sha1').update((sku || url || '') + '|' + w).digest('hex').slice(0, 24);
+  const cacheFile = path.join(THUMB_CACHE, ck + '.jpg');
+  try {
+    if (fs.existsSync(cacheFile)) return sendThumb(res, fs.readFileSync(cacheFile));
+  } catch (e) {}
+
+  const downscale = async (inputBuf) => {
+    const out = await sharp(inputBuf).resize({ width: w, withoutEnlargement: true })
+      .jpeg({ quality: 72 }).toBuffer();
+    try { fs.writeFileSync(cacheFile, out); } catch (e) {}
+    return out;
+  };
+
+  try {
+    if (sku) {
+      const tile = path.join(DATA_DIR, 'gen-tiles', sku + '.png');
+      if (!fs.existsSync(tile)) return res.status(404).send('No tile');
+      return sendThumb(res, await downscale(fs.readFileSync(tile)));
+    }
+    if (url) {
+      let parsed;
+      try { parsed = new URL(url); } catch { return res.status(400).send('Bad url'); }
+      if (parsed.protocol !== 'https:' || !ALLOWED_HOSTS.has(parsed.hostname)) return res.status(403).send('Host not allowed');
+      const https = require('https');
+      const buf = await new Promise((resolve, reject) => {
+        https.get(url, (pr) => {
+          if (pr.statusCode >= 400) { reject(new Error('status ' + pr.statusCode)); pr.resume(); return; }
+          const chunks = []; pr.on('data', c => chunks.push(c)); pr.on('end', () => resolve(Buffer.concat(chunks)));
+        }).on('error', reject);
+      });
+      return sendThumb(res, await downscale(buf));
+    }
+    return res.status(400).send('Missing source');
+  } catch (e) {
+    return res.status(502).send('Thumb error: ' + e.message);
+  }
+});
+
 app.listen(PORT, '0.0.0.0', () => {
   console.log(`Quadrille House Wallcovering Showroom on http://0.0.0.0:${PORT}  (${PRODUCTS.length} wings)`);
 });

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